Flux tube dynamo approach to the solar cycle

Details Flux tube dynamo approach to the solar cycle Flux tube dynamo approach to the solar cycle

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.288..150s&link_type=abstract

Nature, vol. 288, Nov. 13, 1980, p. 150-152.

Astronomy and Astrophysics

Astronomy

48

Dynamo Theory, Solar Activity, Solar Cycles, Solar Flux, Brightness, Magnetic Field Configurations, Sunspot Cycle, X Ray Astronomy

Scientific paper

Implications of the dynamo model for a convective medium pervaded by concentrated flux tubes for the solar activity cycle are examined. It is conjectured that the observed variations of sunspot brightness and the appearance of ephemeral active regions or X-ray bright points are caused by the different ages of the basic flux tubes reaching the photosphere, which may arise due to variations in magnetic field strength in the regions of strong differential rotation in which toroidal flux is produced from a poloidal magnetic field. Consideration is given to a one-dimensional model of a flux tube dynamo in which the poloidal field component is regenerated by an unspecified dynamo process yielding a current parallel or antiparallel to the toroidal field. It is shown that a model with suitably chosen half widths and maximum extensions of the poloidal field produced by one flux tube can account for the observations as an effect of the age of the basic flux tubes. It is noted that phase fluctuations in certain activity measures can be interpreted as fluctuations in the ratio of magnetic flux appearing in ephemeral active regions to that appearing in large active regions with spots and flares.

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